Radek Dvorak is a mystery to me. He's kind of just been a name you hear about but I don't know much about his game. What should I know?
Dvorak is a fine defensive option, much like Vernon Fiddler. He was basically used in the Steve Ott / Adam Burish role for Atlanta last season, starting only 43.4% of the time in the offensive zone - tied for lowest on the Thrashers among regular forwards. His relative corsi score is a low (as it tends to be for people that take alot of faceoffs in their own zone) but his zone shift scores are excellent - the puck generally moves towards the other end of the ice when he's on the ice. QUALCOMP shows that he was pretty much used in all matchup situations for the Thrashers and the Panthers - the coaching staff wasn't worried about protecting him like mr. Pardy.
Dvorak was Atlanta's top PK'ing forward on the team by far and one of the better ones in the league overall. He will probably become the Stars' best PK'er as well - unless Vernon Fiddler returns to 2009-10 form.
Overall a very solid pickup I think. If you're signing depth forwards, you might as well be signing guys like Dvorak and Fiddler that you don't have to worry about getting caught out there against the other team's top lines.